SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e9d44a147cc918a98ec4f44097f3defe46d2ce90304fe16282774f82cee5d2' 
  AND token = 'wDKYvn/H+tQgWM3ZriD+BBaODgYWP5A/VnvkUfhhkQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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