SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa4c7718ecc72e84b1c286888053466716f4e8d352f9e99a2202ec21407b678' 
  AND token = '4m5nVNQ+BAvCgz/IXtpJjmOVaz/s/tgOO+/EVzHOE5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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