Get a page by its template, and optionally by additional criteria

gistfile1.php

<?php

# Get a page by its template, and optionally by additional criteria
function crb_get_page_by_template($template, $additional_meta = array()) {

	// the query for the page template 
	$meta_query = array(
		array(
			'key' => '_wp_page_template',
			'value' => $template,
		)
	);

	// if there is an additional criteria, merge with the above meta query
	if ($additional_meta) {
		$meta_query = array_merge($meta_query, $additional_meta);
		$meta_query['relation'] = 'AND';
	}

	// perform the query
	$pages = get_posts(array(
		'post_type' => 'page',
		'posts_per_page' => 1,
		'orderby' => 'ID',
		'order' => 'ASC',
		'meta_query' => $meta_query
	));

	// get the first page only
	if ($pages && !empty($pages[0])) {
		return $pages[0];
	}

	return false;
}

?>