SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ee36825f8db888abe43f25b108662c720535ab1b7881ad4a7685495773c651' 
  AND token = 'AlbS6RYq377t4V8EHGZLG5jX0v+cipukgTw9a//0ujY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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