SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2596b613472d4d24fb7150757a22d0afcfc7086ff81dd79f6e771b3987180408' 
  AND token = 'ILjVRrMMpU9QPcvG+Tye2UYiZw6KdbiichSMrEvYGXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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