Most efficient way of searching this

[quadrant6]

I have a table of Australian postcodes and address. There are 15k rows with each row looking like this:

postcode	|	suburb	|	state

2048  	|	Westgate	|	NSW
2066		|	Blah		| 	NSW

Triggered by a text input field with jQuery autocomplete, I'm running a search on the suburb and postcode using this code

SELECT address_id as id, CONCAT(suburb,' ',state,' ',postcode) as value FROM address WHERE address_id != ''"; 

foreach ($keywords as $keyword)
{
$query .= " AND (postcode like '".$keyword."%' OR suburb like '%".$keyword."%')";
}

Is that the most efficient way to do it? or should I be considering full text searching?

The above does basically work, I'm just not sure if it's the best practice.