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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25c423b0ab35ac6fafc49ccd5555aaed11176d9865c8e1bf9b99d4b15eab1ed1' 
  AND token = '6wuc3YOUxwFalcwdDl7UiAx6d6mF4WJY8S7clzjbjKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}