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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38553059b8877aa82564197f62df88d15af5333ad34acca1d56f03ce06f4c98c' 
  AND token = 'tJ18dIvWWobdsDBAfukjWDNZV7mydBCc7kb8xaKDXlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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