SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb49d6ae372e7dfbbc5dbffa5dfa95110092acf8686d500223f0608a5496b8c' 
  AND token = 'zq7DzzAIBDFniZhKYSzvRy5nWSDOLpmQvtYnLrjyEgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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