SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b814288ecbbde746f9548f3321b0618cba875691531332c9faa7678e06d6628' 
  AND token = 'DLFlKE8WZtOTy0omH/HDt+eZYJ5g6ck970wqGZuFdDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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