SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9a0c5b0e649674c8cd2fa3f274ec4e800742d2544462cf8edbafe0cf9142a4' 
  AND token = 'oshU8JJgUq+sZtlUt5ndmE/X4wZwuKoZvHUP3qPYImM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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