Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bae50f7e6a529c46b5abbb458a0e969b25e44de3af8c32c46d84beadf28e7e2' 
  AND token = 'xStsM3YB8CmzQw758VCfzrzWQiVIgpYVFMSXokZJhFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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