SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3cb6094f141d2f370778abe94691c95261c0230613a51a584567895e92f5a64' 
  AND token = 'Wswxkhr32J7w2eHGoVKz3kMzvd+HhEyxWxgIVXDvs5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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