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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54bd98af3b71831d3d5ca516541ea50f4989444e6fd30bc43767f0badf517d11' 
  AND token = 'dnbX2sKtigPn4//1Qfcnitaj7noFhOJ0eFhrUs0oJtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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