Simplify code: return a value from map if map is not null and contains key

Can the following piece of code be simplified?

    public Optional<String> myMethod(final Map myMap) {

        String result = null;
        if (myMap != null && myMap.containsKey(Constants.SOME_KEY)) {

            result = (String) myMap.get(Constants.SOME_KEY);
        }
        return Optional.ofNullable(result);
    }