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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33023c7da960ae39ce4f6559403a6d94250d8a75a90a45b23e76dc681a170981' 
  AND token = 'G/LNd41FitNanSBA9zT91NasgZyrDspDRw5SxlJoMlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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