Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f83c1e8356b6bd18f2d24b87c6b2fc5c32ee5bc22322c8eba3b992a27b715c9' 
  AND token = 'JMyDtr0eRTKMcWGApec16sW7OJCqxKWprib2l/83umw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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