Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '608caf58a37e3693b121ebe3992711a769963bba04565b08ca06d91348103085' 
  AND token = '0jupGtXyV6mk2IzokGCVdJXGjGngmvCwyTnUi6LCOjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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