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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26fa60c808c826bdf8c4272b62e0d3c3eb3a435100e42458d5db626a5e569ccd' 
  AND token = 'kNKpXRZvoVoyq5oIehCYXE5Xs26SBAlY6arWX6+aJ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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