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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e82ead75dbdcb36fe1a6f6654d168f7c498bb96f33c1f5f5e7cdf994fa19dcb' 
  AND token = '5xFm4tt2sgbcreXtNyvbPLK2DweYDSXV8/yWoSwec0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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