This method requires no special tools and takes literally 30 seconds to do. This shouldn't be the only method you use to vote, but it can be useful when you've only got a few minutes to spare throughout the day and you still want to be able to use your votes effectively.
The first step is to go to the 'trending' feed and start scrolling down. You want to scroll down until you start seeing posts between $10-$20.
The next step is to scroll all the way back up and then search (ctrl/cmd+f) for the term 'minutes'.
In the above example there are 7 hits. One of them had minutes in the title, but the other 6 detected which posts had gone up within the hour. This is the crux of the method. Because posts on steemit tend to be very momentum based (i.e. dog pile), there's low risk in voting for a post on the trending page which is still fairly new.
Keep searching the term to look through the rest until you find a post that seems interesting and upvoteworthy.
Et voila! That's really all there is to it. Now get out there and earn those curation rewards!