SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f654e6bd919de8686cb705eab17d3a1776ec473f8dc111de7acc2558b29f6080' 
  AND token = 'GHUdj/FUAAz/qi9SDa+zxMo2fI6m7ScIPBBJEht+J+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}