SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e0ea7458f918d28ab5a6fa4ec9231b204e064876c998e3203cba0d1fb6271d' 
  AND token = '+8B+yJilYV3cuzHLY1HTJKpXxUYYHH8GASRPmiXJp8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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