Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512b4f68bcbd034c55060a7315e584a0cc7ec901136124cc8ec00067fa901127' 
  AND token = 'aef3+9iaIblMajXt+ByiVIl66DO8xvlhMWkD5dN5bIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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