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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b67b4a2d9bdd544abfca3d0795d18f65d6bdd50ada0dc6950dc21cb7c639ef' 
  AND token = '/44huzVtsTxldV9Djnld8wgWOViu/LPm3sK8p3iMqUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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