SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '288d763bfac6b1c7501dbd196e1545b41ac21876f40b3c1c87c2b8aadc3af136' 
  AND token = 'V2Au9eEzXZKYhnwuvnyNPBifkhO/z8xLuwVUrx4eIyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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