SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1f95665fe872960153d265ea44f2a0bd2f17859f9b66208ae7384334c9df96' 
  AND token = 'jZfkhai7+W1DIpB+2/I3JkLyqPdYqGXpDEJRL0BATeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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