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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89359afb92a33282aeba5cc40e75f2f516652967d0a7de94638ce40373c8ad89' 
  AND token = 'cx1tg6CJ2zJE87ryh8VNIoqCYgojKcr8bGbchlzv0rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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