Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c5e302dd9c87bff51404099eb7128de8650909e4d0700a57b761cde9456227d' 
  AND token = '1fodtndd6n7MyfwMJsMsgmdxbmmDGl0zwLgEASCc0ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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