SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91555047e76ca9c659339f236f877e1cfd68dd27e6d30204bd1bc594a528d412' 
  AND token = 'jqSTvSWwuOaiEjGu/SsippPBYB53j6ORr5+Hg8ySPTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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