Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837835a50ac616ea86ec43f7ddab617ab1d843a01751326fbf2f2323c57b5cec' 
  AND token = '515bq6vLIayuih8bmPIPvVD2A4M59ZtRbQC7nQS4XFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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