SELECT 
  lang.name, 
  IF(
    cscart_ult_language_values.value IS NULL, 
    lang.value, cscart_ult_language_values.value
  ) as value 
FROM 
  cscart_language_values lang 
  LEFT JOIN cscart_ult_language_values ON cscart_ult_language_values.name = lang.name 
  AND company_id = 2 
  AND cscart_ult_language_values.lang_code = lang.lang_code 
WHERE 
  lang.lang_code = 'ja' 
  AND lang.name IN (
    'cannot_buy', 'no_products_selected', 
    'error_no_items_selected', 'delete_confirmation', 
    'text_out_of_stock', 'items', 'text_required_group_product', 
    'save', 'close', 'notice', 'warning', 
    'error', 'text_are_you_sure_to_proceed', 
    'text_invalid_url', 'error_validator_email', 
    'error_validator_phone', 'error_validator_phone_mask', 
    'error_validator_phone_mask_with_phone', 
    'error_validator_phone_phone_number_with_country_selection', 
    'error_validator_integer', 'error_validator_multiple', 
    'error_validator_password', 'error_validator_required', 
    'error_validator_zipcode', 'error_validator_message', 
    'text_page_loading', 'error_ajax', 
    'text_changes_not_saved', 'text_data_changed', 
    'placing_order', 'order_was_not_placed', 
    'file_browser', 'browse', 'more', 
    'text_no_products_found', 'cookie_is_disabled', 
    'insert_image', 'image_url', 'loading', 
    'text_editing', 'save', 'cancel', 
    'cannot_buy', 'no_products_selected', 
    'error_no_items_selected', 'delete_confirmation', 
    'text_out_of_stock', 'items', 'text_required_group_product', 
    'save', 'close', 'notice', 'warning', 
    'error', 'text_are_you_sure_to_proceed', 
    'text_invalid_url', 'error_validator_email', 
    'error_validator_phone', 'error_validator_phone_mask', 
    'error_validator_phone_mask_with_phone', 
    'error_validator_phone_phone_number_with_country_selection', 
    'error_validator_integer', 'error_validator_multiple', 
    'error_validator_password', 'error_validator_required', 
    'error_validator_zipcode', 'error_validator_message', 
    'text_page_loading', 'error_ajax', 
    'text_changes_not_saved', 'text_data_changed', 
    'placing_order', 'order_was_not_placed', 
    'file_browser', 'browse', 'more', 
    'text_no_products_found', 'cookie_is_disabled', 
    'insert_image', 'image_url', 'loading', 
    'text_editing', 'save', 'cancel'
  )

Query time 0.00079

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "lang",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "392",
      "used_key_parts": ["lang_code", "name"],
      "rows": 41,
      "filtered": 100,
      "index_condition": "lang.lang_code = 'ja' and lang.`name` in ('cannot_buy','no_products_selected','error_no_items_selected','delete_confirmation','text_out_of_stock','items','text_required_group_product','save','close','notice','warning','error','text_are_you_sure_to_proceed','text_invalid_url','error_validator_email','error_validator_phone','error_validator_phone_mask','error_validator_phone_mask_with_phone','error_validator_phone_phone_number_with_country_selection','error_validator_integer','error_validator_multiple','error_validator_password','error_validator_required','error_validator_zipcode','error_validator_message','text_page_loading','error_ajax','text_changes_not_saved','text_data_changed','placing_order','order_was_not_placed','file_browser','browse','more','text_no_products_found','cookie_is_disabled','insert_image','image_url','loading','text_editing','save','cancel','cannot_buy','no_products_selected','error_no_items_selected','delete_confirmation','text_out_of_stock','items','text_required_group_product','save','close','notice','warning','error','text_are_you_sure_to_proceed','text_invalid_url','error_validator_email','error_validator_phone','error_validator_phone_mask','error_validator_phone_mask_with_phone','error_validator_phone_phone_number_with_country_selection','error_validator_integer','error_validator_multiple','error_validator_password','error_validator_required','error_validator_zipcode','error_validator_message','text_page_loading','error_ajax','text_changes_not_saved','text_data_changed','placing_order','order_was_not_placed','file_browser','browse','more','text_no_products_found','cookie_is_disabled','insert_image','image_url','loading','text_editing','save','cancel')"
    },
    "table": {
      "table_name": "cscart_ult_language_values",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "396",
      "used_key_parts": ["lang_code", "name", "company_id"],
      "ref": [
        "cscart_purchase_fl_com.lang.lang_code",
        "cscart_purchase_fl_com.lang.name",
        "const"
      ],
      "rows": 1,
      "filtered": 100
    }
  }
}