Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb9c7ddd41a6e7366a741e50dd8b2acc4b1e1dd2e579a755a65c8c58a6f7a5c' 
  AND token = 'aG4aAM678Je9HIoxsy/rCULvuX9Ht6Bp+iABrtFVKqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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