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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57582b08a8bd86a3b96da7e3f7ab68c4c6dd2dbd74a854255b6ffb4013390d8' 
  AND token = '8n5DnVV02xKLCzymuXRos4dlomnJZjnAUW4oplK43iU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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