SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0736dbd5982a262daf9cf7898b60bb186dad00861d919197cef1b1031011be03' 
  AND token = 'wS+XUlbIM+UWIG7icBh3z0pKVjxXnwusmJEbSoLvqJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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