Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8d1131b0eb09e50abe119832baa8e33e16ece8cf8d7c8100ca907cf7e5e266' 
  AND token = 'wng4Tc6gpZr1ZdRG+bKnyicZRbGV20LbvKL7tezdUNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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