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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbe2bcadd80016f18796638135a8e8718da0eb9db87dfe52944191c7fe08bae' 
  AND token = 'UBpfkBfQK0KGvFCbL65yIZZUPrIfdrbSdhnqxMCSnoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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