input checkbox checked by default?

I have this code:

<div class="checkbox">
    <label>
        <input type="checkbox" data-bind="checked: params.availToStream">
        {{ trans('stream::main.onlyAvailToStream') }} 
    </label>
</div>

I want to have the checkbox checked by default, I have tried the following but cannot get it to work.

<input type="checkbox" data-bind="checked: params.availToStream" selected>

<input type="checkbox" data-bind="checked: params.availToStream" checked="checked">

<input type="checkbox" data-bind="checked: params.availToStream" checked>