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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228c99753356230c07bb05031924194d8813226923544bd88d69608ca98cb9af' 
  AND token = 'Y+wtqgOLmMcRMEK4tD0kUslwE869a3imKRmU5HOWSvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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