SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842489ed4fa86f59269e01dc79e08d279890343ea162cbb1a54b138b2b05f66' 
  AND token = '0048Gq/FumxtV81CIDLBYbz4mxuzE+URu+PSCjVw7gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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