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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d6efd3d4f80a9ebedaed7ff21deaa733e2ba80e8fca80d8f606be82d5b5bd99' 
  AND token = 'GvyIX9/ii7eD1Ngmt8TqZ+ZQpNZHehvbmYiCbf+UmYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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