Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d5a71f3f3be168511c8fc6384cf60e33b4c61e57f276b6f8caa324fe23ac329' 
  AND token = 'QKnk+ydtqghAqVT4QDBW3s4XSbI5u3WmjnAOuBDs+/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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