SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744a547e4a483c92a198697c65332d07f50e94afe5cd0be7148963e28154c814' 
  AND token = 'KwIChYhbskIkwBO/vp/D40Vcz386ltjHlkQK1vzshTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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