Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9abd4192dc1107068bfb42a7f0f2ff3bf7766b8c6876dc9b0bca7d3fc92212e6' 
  AND token = 'eTxnDdZWuy1BpkWVlHEhNs2PvK85qvd4FFRxWM96H4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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