SELECT 
  COUNT(*) 
FROM 
  cscart_product_options 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = cscart_product_options.option_id 
    AND cscart_ult_objects_sharing.share_company_id = 2 
    AND cscart_ult_objects_sharing.share_object_type = 'product_options'
  ) 
WHERE 
  product_id = 139 
  AND status = 'A'

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_options",
      "access_type": "ref",
      "possible_keys": ["PRIMARY", "c_status"],
      "key": "c_status",
      "key_length": "6",
      "used_key_parts": ["product_id", "status"],
      "ref": ["const", "const"],
      "rows": 1,
      "filtered": 100,
      "index_condition": "cscart_product_options.`status` = 'A'"
    },
    "table": {
      "table_name": "cscart_ult_objects_sharing",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "159",
      "used_key_parts": [
        "share_object_id",
        "share_company_id",
        "share_object_type"
      ],
      "ref": [
        "cscart_purchase_fl_com.cscart_product_options.option_id",
        "const",
        "const"
      ],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "cscart_ult_objects_sharing.share_object_id = cscart_product_options.option_id and cscart_ult_objects_sharing.share_object_type = 'product_options'",
      "using_index": true
    }
  }
}