SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a33579699f82f807aead5b4b6d5508b512812f400bb375d414b5296e89f964f' 
  AND token = 'e3CbZCkAl3s5Rg4+k7bixqGHPQpGdVjY7LobZYVgnWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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