SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69aac32ec4da553d866e1e9af12da5d8e2ab5c3043065b74fefb365502f4b89a' 
  AND token = 'hUXmYYs+X49/OZL2WsqVDHroHYThPAs7J52qZjxB3vI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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