Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd415f1e9b83e5cf9b8dfec62afbc9aaee12f4f3a73fb61f64109fb7eb9d0258e' 
  AND token = 'ejRe2bVy8vZnwX6kkokkFaXv8qhJjk7px8AGWW5OPIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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