Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2f6f4bda324b0fc30f641adbd136e08da9610a4a98f8d3d8331370a49ec94f5' 
  AND token = '4xJVkYM/cXI/Z66w9xj2WOV95YLTRtLRCly93mGJvc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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