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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a873b0c82d3048cebabd9ce66cfbbe9ce1d3720382afe5bdc3179f0c4ded61' 
  AND token = 'h99zHmERZBkgYdLCp/YVwHPddd0SNTfv1Zl2JMiIQ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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