SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '341594c23676531b2e2abf2a08483c94c37d54589bb1ba4e4d688021f3f7d0f0' 
  AND token = 'uuoFwI+5tIClQfsJfW6XYwHUDg+/O5V4QKYV5iEfCwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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