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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1934698b6183df28aee8cb31e1bd3cf8d7d0ff68f07c6ac1693c422a68f96f1' 
  AND token = 'WzAABT6w1eACyQZ7yGlSOF3izop6q19MFxR4qY0mPJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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