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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01a8b7afd09ccef513f1c394d2c631301c3726dada7f7ac9be624a3dbb746f8' 
  AND token = 'h0HMql6ZKAWVIMb38npSocLx2TnRqy7yQsEC84HQYRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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