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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2a9794bb058332d3834c0a01c6e4455cdc9776a9cb0bca217e28fa6c5d9fa10' 
  AND token = '98WiPLH4FF1Gl/mxRi3/P7YqSdwJcC4HhSGAfQixicM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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