Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a68cd5549cbb4088826784d43bbb35811ba2f80c022db48b2d4c6ce33264f0' 
  AND token = 'BX+yZz3TxFMHereFAtm/g/JIh23WyZnp4CcmWvo/x1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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