Yup, these people are correct. There are 45 base cards and 15 50th cards (with a little logo on them).
The box is printed saying that it has 60 cards but this includes the 50th deck. The only indicator is a 50th anniversary logo sticker on the shrink wrap on the lower right hand front facing corner.
Inside the 50th cards are packaged separately.
It is funny that the 50 anniversary cards are inside the box while the resin starbases are outside the box.
Back on exploration card number I think 45 is the core for the reprints but by then there will be expansions out that has more exploration cards.