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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '424b01c4be53e909abd4613a8e4acd6c7cfb52f9a16993b28f982969d58eaaa4' 
  AND token = 'ezVJY3USavTJIsUN1bgSrx+jwrv9Anp/gcISsEsFplI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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