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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '836eff87568c7542ac70c2be3863149974e1109a5443400906a264f25c3d785e' 
  AND token = 'rWsfXwXOnvM0Kq2ao+Bfs8hWs55B3d69SLg47Y9J2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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