LunaQL docs are incomplete.
Reference
clauses
query

query

The query clause is used to define a new query.

query.lunaql
query({
 
})

To run a query against a specific collection, you may use the from clause:

users.lunaql
query({
	from({
		users: {
			// query
		};
	});
});

You can also create named queries using the collections clause:

users.lunaql
query({
	from({
		collections({
			admin_users: {
				users: {
					// query
				};
			};
		});
	});
});